Microchip Technology SMAJ26AE3/TR13

Overview

SMAJ26AE3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary and secondary surge protection in DC power rails and signal lines. It features a 26 V reverse standoff voltage (V_WM), 28.9 V minimum breakdown voltage (V_BR), 42.1 V maximum clamping voltage (V_C) at 10.7 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial power supplies and automotive body control modules.

For engineers reviewing the SMAJ26AE3/TR13 datasheet, SMAJ26AE3/TR13 pinout, SMAJ26AE3/TR13 application, or SMAJ26AE3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 (42 Ω source), unidirectional polarity marking, RoHS-compliant matte-tin plating, and compatibility with standard DO-214AC footprint for ESD/EFT and inductive switching transient suppression.

Technical Context

This TVS operates as a silicon avalanche diode with fast response (<100 ps theoretical turn-on time for unidirectional configuration) and low dynamic impedance during transient events. Its junction-to-lead thermal resistance is 15 °C/W, enabling effective heat dissipation when mounted on FR4 with recommended pad layout.

The device complies with IEC61000-4-2 (±15 kV air / ±8 kV contact ESD), IEC61000-4-4 (40 A/m EFT), and IEC61000-4-5 Class 4 secondary lightning protection (12 Ω source, 12 V_WM max) - validated for use in 24 V automotive and industrial control systems where V_WM ≥ 26 V ensures reliable standby operation without leakage-induced stress.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case meeting UL94V-0; cathode indicated by band; weight 0.064 g; moisture sensitivity level (MSL) 1 - no dry pack required.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with Littelfuse SMAJ26A and ON Semi SMAJ26AHE3/A/H, SMAJ26AE3/TR13 provides documented avionics screening pathways (MA/MX prefixes), consistent thermal performance on FR4, and explicit IEC61000-4-5 Class 2–3 validation - critical for safety-critical 24 V system designs.

Availability

SMAJ26AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom remote terminal units requiring stable component supply with RoHS compliance and extended temperature reliability.

Supply support for SMAJ26AE3/TR13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.

The SMAJ series was engineered for robust transient suppression in harsh environments - emphasizing low clamping voltage, fast response, and qualification-ready packaging for mission-critical 24 V and 48 V systems.

FAQ

What is the clamping voltage of SMAJ26AE3/TR13 at its rated peak pulse current?

The SMAJ26AE3/TR13 has a maximum clamping voltage (V_C) of 42.1 V at 10.7 A peak pulse current (I_PP) under the 10/1000 µs waveform. This value ensures downstream components see limited overvoltage during standardized surge events, directly supporting design margining for 24 V systems where 45 V absolute maximum ratings are common.

Is SMAJ26AE3/TR13 unidirectional or bidirectional, and how is polarity marked?

SMAJ26AE3/TR13 is a unidirectional TVS diode, with cathode identified by a visible band on the package body. The "A" suffix in the part number confirms unidirectional construction, distinguishing it from bidirectional variants (e.g., SMAJ26CA) that lack polarity marking and suppress both positive and negative transients.

Does SMAJ26AE3/TR13 meet IEC61000-4-5 for lightning surge immunity?

Yes, SMAJ26AE3/TR13 is validated for IEC61000-4-5 secondary lightning protection: it supports Class 2 (≤16 V_WM) and Class 3 (≤24 V_WM) with 42 Ω source impedance, and Class 2 with 12 Ω source. Its 26 V V_WM places it within the Class 2 envelope for 12 Ω testing per the manufacturer's published classification table.

What is the leakage current specification for SMAJ26AE3/TR13 at its rated standoff voltage?

SMAJ26AE3/TR13 specifies a maximum standby leakage current (I_D) of 1 µA at its 26 V reverse standoff voltage (V_WM). This ultra-low leakage ensures minimal power loss in always-on 24 V circuits and avoids false triggering in high-impedance sensor interfaces or battery-backed systems.

Can SMAJ26AE3/TR13 be used in place of through-hole P5KE26A for board space savings?

SMAJ26AE3/TR13 is the surface-mount counterpart to the axial-lead P5KE26A, sharing identical electrical parameters (V_WM, V_BR, V_C, P_PP) but in DO-214AC packaging. It enables PCB area reduction and automated assembly, though thermal dissipation differs due to mounting method - verify junction temperature rise using the 15 °C/W junction-to-lead spec under actual layout conditions.